Butler's purpose is to make it easier for you to perform different â” potentially recurring â” tasks. Butler lets you arrange these tasks in its fully customizable configuration. You can use it to launch or control various apps with universal triggers and/or keyboard shortcuts.

I love this "Swiss Army Knife" of productivity shortcuts for Mac, and miss it dearly whenever I am not on my own Mac. I use app launching via abbreviations, keyboard shortcuts, embedded Applescripts, multiple clipboards, and search launching. I don't use it for a bookmark manager, it seems clumsy for that.

Butler is one of the first things I install on a new Mac, and the first thing I miss when I use a computer that isn't mine. I prefer to turn off all of Butler's menu bar add-ons and keep it completely hidden till I summon it from the keyboard. The features I use, in order of essentialness, are (1) application launching, (2) global iTunes control, (3) instant web searches, (4) multiple clipboards.

I stopped using Butler, as I had a problem with it. Despite several emails to their 'support' staff (non-existant) I received no emails after waiting months. I truly regret paying for Butler, as why should I reward developers that do not support their users.

I used Butler for a while and I liked it a lot. The pasteboard feature is really nice. Other than that I just used it to make a menu with different types of searches on it.

I stopped using Butler when I figured out how to replicate the pasteboard feature using Quicksilver's clipboard history plugin. At that point, it wasn't worth the extra overhead, since I'm already running Quicksilver as an app launcher. I wrote an article for Macinstruct detailing how to install and use Quicksilver's clipboard history plugin:
http://www.macinstruct.com/node/186

Note: Butler comes with pre-configured keyboard shortcuts that can conflict with you existing ones.
I didn't find how to get a list of all the shortcuts that have been set in Butler, so it's not that easy to find the entry to which the conflicting shortcut has been assigned.
However, in this case Butler's shortcut was useful (ie: skip to next track in iTunes) so I kept it over my existing one. :)

I really like the menubar adds for this app. the only thing is i didnt want to have to go in and attach shortcuts to all my apps... lol, im really lazy like that. usually, i just type in the first couple of letters for the app into launchbar, and hope i get it right.

Bar far, a very extensive and useful app if you want alot of menubar shortcuts.